White French Bulldogs and Deafness: Risks and Hearing Tests

Why white coats and deafness are linked

Hearing depends on pigment cells (melanocytes) inside the inner ear. Genes that create white areas on the coat can also leave the inner ear without these cells. When that happens, a structure called the stria vascularis breaks down in the first weeks of life, and the ear becomes permanently deaf.

The Merck Veterinary Manual describes this as cochleosaccular deafness. It "develops within 1–3 weeks after birth," "can be unilateral or bilateral," and is "most common in dogs with the piebald or merle pigmentation genes." Affected ears "are totally deaf."^[1] It cannot be treated, but it does not cause pain or get worse.

White, piebald or double merle?

A "white" French Bulldog can come from different genetic backgrounds, and the risk differs:

• White, cream or very light fawn: accepted colors under the AKC standard.^[2] A light fawn or cream coat is not the same as white spotting.
• Piebald (white with patches): also accepted. Piebald is one of the pigment patterns Merck links to inherited deafness.^[1] Dogs with very large white areas, especially white heads and ears, are generally thought to carry more risk.
• Double merle (often mostly white): a dog with two copies of the merle gene. UC Davis notes double merles "often can have an all white coat" along with possible hearing and eye defects.^[3] In one study, 25% of double merles had hearing loss.^[4]

If a white puppy's parents are merle, or the seller advertises merle colors, ask for a merle DNA test.

Signs your puppy may not hear

• Sleeps through loud noises, like a door slam or a vacuum cleaner
• Does not turn toward its name or a squeaky toy out of sight
• Startles when touched from behind
• Barks unusually loudly or plays very roughly with littermates

Hand-clapping tests are not reliable. Puppies can feel vibration and see movement, and a dog with one hearing ear responds to sound normally. Merck notes that unilateral deafness "may go undetected" without proper testing.^[1]

The BAER hearing test

BAER (brainstem auditory evoked response) measures the brain's electrical response to clicks played into each ear. Merck calls it the test that "provides the most definitive diagnosis."^[1]

• It tests each ear separately, so it detects one-sided deafness.
• It is quick and usually done without general anesthesia.
• It is often done from around 5 to 6 weeks of age, once the ear canals have opened. Ask the testing clinic about their minimum age.
• Veterinary schools, neurology clinics and some breed-club events offer it.

Merck adds that BAER testing combined with careful breeding choices is often the best way to lower deafness within a breed.^[1]

Raising a deaf Frenchie

• Teach hand signals for the basics. Use a "thumbs up" or open hand as a marker for good behavior.
• Get attention with light or touch: flick a porch light, use a vibration collar (never a shock collar), or tap the floor.
• Always leash outside or use a secure fence.
• Wake gently with a light touch on the shoulder, so the dog does not startle and snap.
• Add an ID tag that says "I am deaf."

A dog deaf in one ear usually needs no special training, although it may have trouble telling which direction a sound came from.

Questions to ask a breeder

• "Has this puppy had a BAER test? Can I see the results for each ear?"
• "Are either of the parents merle or cryptic merle? Do you have M-locus DNA results?"
• "Have any puppies from these parents been deaf?"